From the Butterick website:
Rompers A, B or A-line jumpers C, D have button shoulder closing. B:Elastic legs. A, B: Snap crotch. C: contrast tie ends. D: Criss-cross back straps, patch pockets and purchased trim. C, D: Contrast reverse side. Panties have elastic waist and legs, no side seams. Bucket hat has crown, brim and elastic, and in head sizes 18", 181/2", 19", 191/2", 20".